diff --git a/src/jesse_state.erl b/src/jesse_state.erl
index 8ded981..304005b 100644
--- a/src/jesse_state.erl
+++ b/src/jesse_state.erl
@@ -50,7 +50,6 @@
 %% Includes
 -include("jesse_schema_validator.hrl").
 
--type extra_validator() :: fun((jesse:json_term(), state()) -> state()) | undefined.
 %% Internal datastructures
 -record( state
        , { root_schema        :: jesse:json_term()
@@ -75,6 +74,9 @@
          }
        ).
 
+-type extra_validator() :: fun((jesse:json_term(), state()) -> state())
+                         | undefined.
+
 -opaque state() :: #state{}.
 
 %%% API
@@ -393,4 +395,6 @@ load_schema(#state{schema_loader_fun = LoaderFun}, SchemaURI) ->
       ?not_found
   end.
 
-get_extra_validator(#state{extra_validator=Fun}) -> Fun.
+%% @private
+get_extra_validator(#state{extra_validator = Fun}) ->
+  Fun.
diff --git a/src/jesse_validator_draft3.erl b/src/jesse_validator_draft3.erl
index e77719d..03d700e 100644
--- a/src/jesse_validator_draft3.erl
+++ b/src/jesse_validator_draft3.erl
@@ -1035,7 +1035,7 @@ remove_last_from_path(State) ->
 
 %% @private
 check_external_validation(Value, State) ->
-    case jesse_state:get_extra_validator(State) of
-        undefined -> State;
-        Fun -> Fun(Value, State)
-    end.
+  case jesse_state:get_extra_validator(State) of
+    undefined -> State;
+    Fun -> Fun(Value, State)
+  end.
diff --git a/src/jesse_validator_draft4.erl b/src/jesse_validator_draft4.erl
index cb50ca6..119e51d 100644
--- a/src/jesse_validator_draft4.erl
+++ b/src/jesse_validator_draft4.erl
@@ -1365,7 +1365,7 @@ valid_datetime(DateTimeBin) ->
   end.
 
 check_external_validation(Value, State) ->
-    case jesse_state:get_extra_validator(State) of
-        undefined -> State;
-        Fun -> Fun(Value, State)
-    end.
+  case jesse_state:get_extra_validator(State) of
+    undefined -> State;
+    Fun -> Fun(Value, State)
+  end.